const tagsView = {
    state: {
      visitedViews: [],
      cachedViews: []
    },
    mutations: {
      ADD_VISITED_VIEW: (state, view) => {
        if (state.visitedViews.some(v => v.path === view.path)) return
        state.visitedViews.push(
          Object.assign({}, view, {
            title: view.meta.title || 'no-name'
          })
        )
      },
      ADD_CACHED_VIEW: (state, view) => {
        if (state.cachedViews.includes(view.name)) return
        if (!view.meta.noCache) {
          state.cachedViews.push(view.name)
        }
      },
  
      DEL_VISITED_VIEW: (state, view) => {
        for (const [i, v] of state.visitedViews.entries()) {
          if (v.path === view.path) {
            state.visitedViews.splice(i, 1)
            break
          }
        }
      },
      DEL_CACHED_VIEW: (state, view) => {
        for (const i of state.cachedViews) {
          if (i === view.name) {
            const index = state.cachedViews.indexOf(i)
            state.cachedViews.splice(index, 1)
            break
          }
        }
      },
  
      DEL_OTHERS_VISITED_VIEWS: (state, view) => {
        for (const [i, v] of state.visitedViews.entries()) {
          if (v.path === view.path) {
            state.visitedViews = state.visitedViews.slice(i, i + 1)
            break
          }
        }
      },
      DEL_OTHERS_CACHED_VIEWS: (state, view) => {
        for (const i of state.cachedViews) {
          if (i === view.name) {
            const index = state.cachedViews.indexOf(i)
            state.cachedViews = state.cachedViews.slice(index, index + 1)
            break
          }
        }
      },
  
      DEL_ALL_VISITED_VIEWS: state => {
        state.visitedViews = []
      },
      DEL_ALL_CACHED_VIEWS: state => {
        state.cachedViews = []
      },
  
      UPDATE_VISITED_VIEW: (state, view) => {
        for (let v of state.visitedViews) {
          if (v.path === view.path) {
            v = Object.assign(v, view)
            break
          }
        }
      }
  
    },
    actions: {
      addView({ dispatch }, view) {
        dispatch('addVisitedView', view)
        dispatch('addCachedView', view)
      },
      addVisitedView({ commit }, view) {
        commit('ADD_VISITED_VIEW', view)
      },
      addCachedView({ commit }, view) {
        commit('ADD_CACHED_VIEW', view)
      },
  
      delView({ dispatch, state }, view) {
        return new Promise(resolve => {
          dispatch('delVisitedView', view)
          dispatch('delCachedView', view)
          resolve({
            visitedViews: [...state.visitedViews],
            cachedViews: [...state.cachedViews]
          })
        })
      },
      delVisitedView({ commit, state }, view) {
        return new Promise(resolve => {
          commit('DEL_VISITED_VIEW', view)
          resolve([...state.visitedViews])
        })
      },
      delCachedView({ commit, state }, view) {
        return new Promise(resolve => {
          commit('DEL_CACHED_VIEW', view)
          resolve([...state.cachedViews])
        })
      },
  
      delOthersViews({ dispatch, state }, view) {
        return new Promise(resolve => {
          dispatch('delOthersVisitedViews', view)
          dispatch('delOthersCachedViews', view)
          resolve({
            visitedViews: [...state.visitedViews],
            cachedViews: [...state.cachedViews]
          })
        })
      },
      delOthersVisitedViews({ commit, state }, view) {
        return new Promise(resolve => {
          commit('DEL_OTHERS_VISITED_VIEWS', view)
          resolve([...state.visitedViews])
        })
      },
      delOthersCachedViews({ commit, state }, view) {
        return new Promise(resolve => {
          commit('DEL_OTHERS_CACHED_VIEWS', view)
          resolve([...state.cachedViews])
        })
      },
  
      delAllViews({ dispatch, state }, view) {
        return new Promise(resolve => {
          dispatch('delAllVisitedViews', view)
          dispatch('delAllCachedViews', view)
          resolve({
            visitedViews: [...state.visitedViews],
            cachedViews: [...state.cachedViews]
          })
        })
      },
      delAllVisitedViews({ commit, state }) {
        return new Promise(resolve => {
          commit('DEL_ALL_VISITED_VIEWS')
          resolve([...state.visitedViews])
        })
      },
      delAllCachedViews({ commit, state }) {
        return new Promise(resolve => {
          commit('DEL_ALL_CACHED_VIEWS')
          resolve([...state.cachedViews])
        })
      },
  
      updateVisitedView({ commit }, view) {
        commit('UPDATE_VISITED_VIEW', view)
      }
    }
  }
  
  export default tagsView
  